linux-kernel - Re: [PATCH] mm/shmem: initialize folio to NULL

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <YnkeUz0Z2O9Xd5O+@casper.infradead.org>
Date:   Mon, 9 May 2022 14:59:47 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Tom Rix <trix@...hat.com>
Cc:     hughd@...gle.com, akpm@...ux-foundation.org, nathan@...nel.org,
        ndesaulniers@...gle.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] mm/shmem: initialize folio to NULL

On Mon, May 09, 2022 at 08:31:16AM -0400, Tom Rix wrote:
> The clang build fails with
> mm/shmem.c:1704:7: error: variable 'folio' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
>   if (!page) {
>        ^~~~~
> The error handler for !page jumps to an if-check for an unset folio.
> So initialize folio to NULL.

I appreciate you're trying to help, but the fourth report of a problem
adds more noise than utility.

https://lore.kernel.org/linux-mm/?q=shmem+folio

shows emails about this from the cgelbot, Dan Carpenter, SeongJae Park,
Colin King, Nathan Chancellor and Sebastian Siewior.  So actually you
were seventh, not fourth.